0.0112
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I guess you figure that 6 x 9 = 54. So 537 is close to 540 (which is 54 x 10). So divide 54/6 = 9, then multiply by ten for 90 as an estimate to the quotient.
The best way to estimate a quotient using compatible numbers is to first understand how compatible numbers work. They are numbers that are close in value to the actual numbers and are easily added, subtracted or divided.
8.6932
6.9877
19.8889
11